I have a 4270 printer and the error code is 1203.

This article in the Lexmark website will help you identify and resolve the 1203 cartridge error problem: 1203 Error Message on the Lexmark X7170 All-In-One

error 1203 is cartridge error, cartridges has a short
1. press power button to turn off your printer
2. unplug your printer to the wall outlet
3. plug in your all in one
4. reinstall your cartridges
if this does not resolve the problem replace your cartridges with new one
for more trouble shooting option :
1. click start> program> lexmark 4200 series> lexmark solution center
2. click the trouble shooting tab on the left side of the screen
i hope this helpful
thank you for using fixya

The 1203 error may be caused by a defective cartridge or a communication failure between one of the cartridges and the printer. Please visit the Lexmark website at http://bit.ly/aDUAjM for the troubleshooting steps. If the error continues, contact Lexmark technical support. Thank you for choosing Lexmark.

Cartridge Error: 1203
Your print cartridge has a short.
1.Press Power to turn your All-In-One off.
2.Unplug your All-In-One from the wall outlet.
3.Plug in your All-In-One.
4.Reinstall the cartridges.
If this does not resolve the problem or replace your cartridges.

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I HAVE AN ERROR CODE 1203

OK
Error 1203 is an issue that occurs either when a cartridge is bad or the printer cartridge Slot is bad...

1 - try cleaning the copper contacts of the both carts and cart slot in the printer and try again..
or
2 - when error shows up, shut the printers power off; wait one minute and turn it back on press copy.
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All The Best: Pineworks

Please visit this below mentioned link to solve your problem:

Error Code 1203

Thank you

the lexmark f4270 displays an error message #1203. how do i get the printer working again

Fax does not require installation on the PC. Driver for Vista is here: http://downloads.lexmark.com/cgi-perl/downloads.cgi?ccs=229:1:0:438:0:0